implemented '[.binary' and '!.binary' to avoid »disappearing attributes.

Added some detail information to function binary. according little and big endian. Added arguments signed and littleEndian again.

testing for missing arument at as.binary function.
update of @usage and @param to binary function
changed example of bin2dec function. added littleEndian support to function bin2dec.

changed example from switchEndianess function.
Did not work. Needs to be tested.

returning rev(x). as.binary does not need to be called. because '[.binary' has been overloaded to save binary attributes.

some changes in dec2bin function to support littleEndian. some code to avoid disappearance of attributes.
removed signed argument from function binAdd. Not needed anymore (see changes at BinaryS3).
Getting information from binary attributes.

modified function negate to work with new binary class.
deactivated some tests.